Mortise lock



April 25, 19 19. s. J. c. COTTRELL. 2,468,323

MORTICE LOCK Filed Oct. 12, 1946 nvvlE/vrcue STEPHEN J.c. COTTRELL Patented Apr. 26, 1949 2,468,323 MORTISE LOCK Stephen J. C. Cottrell, Vancouver, British Columbia, Canada Application October 12, 1946, Serial No. 702,951

2 Claims.

My invention relates to improvements in mortice locks.

It is a common procedure of householders to lock doors at the head of a basement stairway and basement outside doors and to leave the key in the lock to prevent said lock from being picked. Burglars find no serious diificulty in turning the key to the extent that it may be easily removed or pushed out of the lock and then resort to the usual lock picking process to gain access to the house.

The object of the present invention is to provide a rotatable disk within the lock, which disk is adapted to turn concentrically with the key and cover up the key slot on one side of the look, so that access to the locking mechanism by picking tools is prevented as long as the key remains in the lock and rests in any position of angularity to the key hole slot in the outside of the lock cas- Referring to the drawings:

Fig. 1 is a longitudinal sectional view of a common mortice lock fitted with the invention.

Fig. 2 is a sectional View taken on the line 2-2 of Figure 1.

Fig. 3 is a plan view of a non-rotating ward disk, looking up.

Fig. 4 is a sectional view of Figure 3.

In the drawings like characters of reference indicate corresponding parts in each figure.

The numeral 1 indicates a lock casing having a removable cover plate 2. The lock casing is provided with a front plate 3 through which a latch bolt 4 and a dead bolt 5 are adapted to be projected.

The dead bolt 5 is provided with the usual shank 1 having an inverted V-shaped notch 8 on its underside which terminates in a rectangular gap 9 to receive the free end of the bit ll of a standard key 12 to reciprocate the lock. The endwise movement of the dead bolt is facilitated by the lifting of a tumbler M which is pivotally mounted behind the dead bolt shank I.

The operating mechanism of the lock above referred to may be of any particular design, therefore, detailed description is not deemed to benecessary.

The usual keyhole i5 is provided in both the lock casing l and the cover plate 2 and surtaken on the line 4-4 rounding the key stem portion of each keyhole are circular recesses l1 and I8, each having diametrically opposed apertures 2|. As shown in Figure 2, the lock casing is disposed towards the outside of the door and the door is normally to be locked and its key l2 left within the lock.

The numeral '23 indicates a sleeve which extends from one key hole of the lock to the other. This sleeve is slotted longitudinally as at 24 and is fitted at one end with a disk 25 having a radial slot 26 aligned with the slot 24. The disk 25 is adapted to be placed in the recess H, or the recess which happens to be adjacent the outside of the door.

A disk 28 having a central opening 29 and radial slot 30 is adapted to be inserted into the recess [8 of the lock cover 2, which in this particular showing, is adjacent the inside of the door. The disc 28 is provided with diametrically opposed lugs 32 which project into the apertures 2| of the recess to hold it against rotation and the sleeve 23 is reduced at its free end to form a spigot 33 to enter the central opening 29 and a shoulder 34 to bear against the disk 28 and hold it in adjusted position within its recess. On the inner side of the disk 28 one or more projections 36 are provided, which are preferably disposed on opposite sides of the slot 30 to register with the wards 38 of the key l2.

In operation, the householder desiring to lock the door from the inside, will enter the key l2 from the side shown in Figure 2, the key first passing through the stationary disk '28 and through the sleeve 23, and the free end of the stem of said key will pass through the slot 26 of the disk 25. The turning of the key to lock the door will cause the disk 25 to rotate simultaneously with said key, so that if the key is left in the lock and is not turned far enough to be withdrawn from the lock, the disk 25 will cover up the slot of the keyhole, or in the instant case, the keyhole in the lock casing I, thus preventing access to the lock from the outside of the door.

If the owner wishes to leave the house locked temporarily from the outside, then the withdrawa1 of the key from the inside will align the slot 26 with the outside keyhole of the lock, so that said key may be freely entered from the outside.

It will be realized that if it is desired to change a lock from right to left hand or vice versa, it may be done by merely reversing the disks 2-5 and 28 in the lock.

What I claim as my invention is:

1. A lock having a body including opposing side plates provided with aligned key holes and a dead bolt between said side plates adapted for reciprocation by a bit key, each of said side plates having a recess concentric with the key axis of the key holes, a disk having a radial slot nonrotatably mounted in one recess and a disk having a concentrically mounted slotted sleeve rotatable in the opposite recess, said slotted sleeve being adapted for engagement by the bit of the key to rotate the slotted disk attached thereto.

2. A lock having a body including opposing side plates provided with aligned key holes and a dead bolt between said side plates adapted for reciprocation by a bit key, each of said side plates having a recess concentric with the key axis of 4 the key holes, a disk having a radial slot nonrotatably mounted in one recess, said disk having a projection adapted to pass the ward of the bit of the key and a disk having a concentrically mounted slotted sleeve rotatable in the opposite recess, said slotted sleeve being adapted for engagement by the bit of the key to rotate the slotted disk attached thereto.

STEPHEN J. C. CO'I'I'RELL.

REFERENCES CITED The following references are of record in the file of this patent: 15 UNITED STATES PATENTS Number Name Date 287,991 Allen Nov. 6, 1883 430,501 Yates June 17, 1890 907,318 Curlett Dec. 22, 1908 20 1,133,104 Cormier Mar. 23, 1915 

